EspoCRM - EspoCRM is open source CRM (Customer Relationship Management) software that allows you to see, enter and evaluate all your company relationships regardless of the type.

BareMetrics - SaaS Analytics for Stripe

CiviCRM - A Constituent relationship management for the Civic Sector

Salesforce Data.com - Data.com provides company profiles and contact information across millions of businesses worldwide.

Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.

Stunning - Dunning emails, failed payments, churn prevention, event notifications, custom HTML receipts and more for Stripe subscriptions, with iPhone app and push notifications